Across
- 2. A charged particle.
- 3. Substance with a pH below 7.
- 4. Substance with a pH above 7.
- 6. A substance made of two elements chemically combined.
- 7. A substance that increases the speed of a chemical reaction.
- 8. A combination of atoms bonded together.
Down
- 1. Chart that organizes elements by atomic number.
- 3. The smallest unit of matter.
- 5. A chemical change that forms new substances.